7
LO-PRO IO&M
B51021-004
Troubleshooting
Problem and Potential Cause
Low Capacity or Pressure:
•
Incorrect direction of rotation. Make sure the fan rotates
in same direction as the arrows on the motor or belt drive
assembly
•
Poor fan inlet conditions. There should be a straight clear
duct at the inlet
•
Improper wheel alignment
Excessive Vibration and Noise:
•
Damaged or unbalanced wheel
•
Belts too loose; worn or oily belts
•
Speed too high
•
Incorrect direction of rotation. Make sure the fan rotates
in same direction as the arrows on the motor or belt drive
assembly
•
Bearings need lubrication or replacement
•
Fan surge
Overheated Motor:
•
Motor improperly wired
•
Incorrect direction of rotation. Make sure the fan rotates
in same direction as the arrows on the motor or belt drive
assembly
•
Cooling air diverted or blocked
•
Improper inlet clearance
•
Incorrect fan RPMs
•
Incorrect voltage
Overheated Bearings:
•
Improper bearing lubrication
•
Excessive belt tension
